Nikon AF-S DX Zoom Nikkor 18-135/3.5-5.6G ED, Repair Manual

Page: 41 / 98

JAA79651-R.3695.A
- Ａ 20・AF-S DX 18-135/3.5-5.6G -
●
How to inspect and adjust:
● Oscilloscope setting
V/Div
（
CH1
） ：
20mv
V/Div
（
CH2
） ：
20mv
coupling
：
AC
Time/Div :5msec
Trigger Mode :NORMAL
Trigger Coupling :AC
Trigger Source :CH1
Trigger Position :+4div
Trigger Type :EDGE
Trigger Level :0V
INPUT(CH1) :AC
INPUT(CH2) :AC
①
Confirm that the electric current and voltage of the connected rated voltage power-supply are set values,
then turn it ON.
②
Set the oscilloscope, and turn the focus ring, which was temporarily attached.
Note
:
The waveform varies according to the rotational speed. So change "Time/
Div” setting accordingly.
・
In case large waveform-noise is detected, use the
FILTER function.
How to set FILTER function (e.g. DL1540
manufactured by YOKOGAWA
）
1. Press the FILTER button.
2. Select “Smooth” of the menu on screen and turn it
ON.
③
In case the amplitude is small, disassemble up to the stage
of the GMR FPC and check the condition of the MR head.
If the deformation is detected, correct the deform of the
MR head.
If, however, such correction is impossible or no
deformation is detected, replace the GMR FPC. (Fig.1)
Note: When adjustments are made, prevent the magnetic
surface and MR head from touching the magnetized
driver bit. Otherwise, the magnetic data will be damaged.
CH1
CH2
#110×2
MR head
GMR FPC
Fig.1
Standard: Amplitude of all pulses/wave-
forms is 100mV or more.
Note: Check the waveform by moving the
focus ring back and forth from the
infinity-end to the close-end positions
entirely.